The invention belongs to the field of hole
machining, and particularly relates to a hole
machining ejector
drill system and a
drill bit thereof, which are used for improving the
machining capacity andquality of holes. The
drill bit is connected to a drill rod, an inner
pipe is a
scrap iron
discharge channel, an annular channel for
chip liquid to flow in is formed between the inner
pipe and an outer
pipe for
oil supply, oil through holes are distributed in the
drill bit along the circumference, one part of
cutting fluid flows to the
cutting edge part, the other part of the
cutting fluid is obliquely sprayed backwards, a plurality of wedge-shaped protrusions are arranged on the
drill bit along the circumference, the wedge-shaped protrusions and the inner wall of a machined
deep hole form awedge-shaped space, and a wedge-shaped
oil film is formed when oil liquid flows through the wedge-shaped space. The distance between the wedge-shaped protrusions and the inner wall of the machined
deep hole is very small or equal to zero, the self-centering force of the
drill bit is finely adjusted through an adjusting
cushion block, a positioning piece and the screw rod as required, the liquid force is large and convenient to estimate, the drill bit is high in self-centering precision and good in self-correcting effect, the precision of a cutter
system is easy to guarantee and high-speed rotation can be realized, and the length of the drill bit is larger than that of an existing corresponding drill bit of the ejector drill.